This circuit was found in Radio Electronics from the 90s. It converts capacitance into frequency in order to obtain a proportional voltage that can be measured in a common multimeter.
This circuit appears in several versions on this site. It is designed to be used between the...
This circuit uses a piezoelectric tweeter to emit a powerful continuous sound above the audible...
This circuit is based on a Siemens S566B integrated circuit. The circuit is from a Radio...